Blue azo dyes.



Unrrn s'inrns resists orinon.

MYRTIL KAI-IN AND ANTON OSSENBEGK, GI ELBEBFELD, GERMANY,

ASSIGNORS TO FARBENFABRIKEN. VGRM. FRIEDR. BAYER & 50., E ELBERFELD, GERMANY, A

CORPORATION OF GERMANY.

BLUE AZO BYE-S.

No Drawing.

T 0 all whom it may concern. Be it known that we, MYRTIL Hun: and AN'roN 'OssnNnsoK, doctors of philosophy, chemists, citizens of the German Empire, residing at Elberfeld, Germany, have invented new and useful Improvements in Blue Azo Dyes, of which the following is specification.

We have found that new and valuable cotton dyes can be obtained by combining two molecules of. a diazotized acidyl-paraphenylenediamin sulfonic acid with one. molecule of the 5.5-dioxy-QQ-dinaphthylaminJfi-di sulfonic acid of the formula:

splitting oil the acidyl radicals, tetrazotizr ing and coupling the resulting tetrazo compounds with an azodye-stuli component, such as resorcin, a meta-diamin, nieta-aminophe nor or their-derivatives.

The new products dye cotton generally blue bright shades. The colors can he developed on the fiber with diaZot-ized paranit-ranilin, black fast shades being obtained. They are after being dried and pulverized in the shape of their alkaline salts dark powders soluble in water and in concern tratcd sulfuric acid generally with. a blue,

coloration; yielding upon reduction with stannous ehlorid and hydrochloric acid paraphenylenedianiin-sulfonic acid, 6.6. diaiuino- 5.5-dioxy-22-dinaph thylamin KT-disHIibnic 4o acid and an aniin.

In order to illustrate the new process more l H, 1- i l il c n s N e, 2\ n I,

911 Instead of metaphenyienediamin other components, such as resorein, metaamino- 85 phenol, etc, can be used.

WVe claim: 1. The herein described new dyestuffs de rived from the a,.5-dioXy-2.2-dinaphthyl- 1 Specification of Letters Patent.

Application filed April 1, 1913. Serial No. 258,208.

Patented Nov. 18,1913.

fully the following example is given, the parts by weightz-52 parts of oxalylparaqihenylenediamin-sulfonic acid are diazotized with 60 parts of concentrated hydrochloric acid (1.16 specific gravity) and 13.8 parts of nitrite. The diazo solution is then added to a solution cooled to zero of 50.5 parts of the 5.5-dioxy-22-dinaphthylamin- 7.1disultonic acid (sodium salt in 1000 parts of water and 42 parts of calcined soda. The mixture is stirred during 1 to 2 hours, heated to 90 C. and kept at this temperature during half an hour after the addition of 300 parts of a 33 per cent. caustic soda lye. Sui quently the mixture is neutralized with EC l and the dye is salted out and filtered it then stirred up with 1500 parts of a; er, rendered slightly alkaline with caustic soda lye. cooled to 10 C., acidulated with parts of hydrochloric acid, 13.8 parts of souium nitrite are added and stirred during 6 hours. The mixture thus obtained is introduced into a solution of 22 parts of metaphen ienediamin in 1000 parts of water containing 60 parts of calcined sodium carbonate. The mixture is heated to 6070 C. and the dye is salted out and ,filtered oil. It is after being dried and pulverized in the ape of its sodium salt a brownish-black powder soluble in water with a. blue coloration, soluble in concentrated sulfuric acid (66 with a greenish-blue coloration. Upon treatment with stannous chlorid and hydrochloric acid it is split up, the V6.6-dio 5.:i-dwiry-2.2-dinaphthylamin-7.7-disu..l onic acid, paraphenylenediamin-sulfonic acid and triaminobenzene are obtained. It s cotton direct blue, after treatment with dhiotized paranitranilin black shades, and has in a free state most probably the formula:

amin-7.7-disulfonic acid, para-phenylenediamin'sulfonic acid and an azo dyestufi' component, which dyes are ai'terbeing dried and pulverized in the shape of their alkaline salts dark powders soluble in water and in concentrated sulfuric acid generally with a.

which is after being'dried and pulverized in the shape of its sodium salt. a brownishblack powder soluble in water with a blue ar d in concentrated sulfuric acid (66. B.)

with a greenish-blue coloration; yielding upon treatmentwith stannous chlorid'and hydrochlol ic acid 6.6-diamino-5.5-dioxy-2.2- dinaphthylamim7.7-disulfonic acid, parv phenylenediainih-sulfonic acid and tIlZLIIIi-l nohenzene; and dyeing cotton blue, after! with diazotized para-nitranilin black shades, substantially as described.

2. The herein described new dyestutl" having in a free state mustprobably the fof- 10 mula:

soai

treatment with diazctized para-nitranili-n black shades, substantially as described.

In testimony whereof we have hereunto set 25 our hands in the presence of two subscribix'ig witnesses.

. MYRTIL KAHN. I [11. s] ANTON OSSENBECK. I [1,. s.] lVitnesses: 4' I HELEN NUFER, Dom NIH-ER. 

